These Nokya Heavy Duty Headlight High Beam 9005 Wire Harnesses have been designed to be plugged into your GMC Pickup's stock wiring. Aftermarket bulbs or not, your GMC Pickup stock lighting 9005 harnesses are not designed to handle extended periods of use, or operation in adverse or severe conditions. To address this, Nokya offers these 9005 Heavy Duty Headlight High Beam harnesses as a cheap and relatively easy upgrade to your stock GMC Pickup electrical system. They work as replacements for damaged stock 9005 harness plugs, or as complete upgrades as a precautionary measure against harness plug burnouts (which can permanently damage your GMC Pickup headlight housings). These GMC Pickup Heavy Duty Headlight High Beam 9005 Wire Harnesses also help to handle the increased demands of aftermarket Headlight High Beam bulbs, Nokya brand or otherwise. Each set consists of 2 harnesses.